package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

/**
 * @author 苏靓仔
 * @version 1.0
 */
@Service
public class DishServiceImpl implements DishService {

	@Resource
	private DishMapper dishMapper;

	@Resource
	private DishFlavorMapper dishFlavorMapper;

	@Resource
	private SetmealDishMapper setmealDishMapper;

	@Autowired
	private SetmealMapper setmealMapper;

	@Transactional
	@Override
	public void save(DishVO dishVO) {
		Dish dish = new Dish();
		BeanUtils.copyProperties(dishVO, dish);
		dishMapper.insert(dish);
		// 获取insert语句生成的主键值
		Long dishId = dish.getId();
		// 向口味表插入n条数据
		List<DishFlavor> flavors = dishVO.getFlavors();
		if (flavors != null && flavors.size() > 0) {
			flavors.forEach(dishFlavor -> {
				dishFlavor.setDishId(dishId);
			});
			// 向口味表插入n条数据
			dishFlavorMapper.insertBatch(flavors);
		}
	}

	/**
	 * 菜品分页查询
	 *
	 * @param dishPageQueryDTO
	 * @return
	 */
	@Override
	public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
		PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
		Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
		long total = page.getTotal();
		List<DishVO> result = page.getResult();
		return new PageResult(total, result);
	}

	/**
	 * 菜品批量删除
	 *
	 * @param ids
	 */
	@Transactional
	@Override
	public void deleteBatch(List<Long> ids) {

		// 判断当前菜品是否能够删除--是否存在起售中的菜品
		for (Long id : ids) {
			Dish dish = dishMapper.getById(id);
			if (dish.getStatus() == StatusConstant.ENABLE){
				throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
			}
		}
		// 判断当前菜品是否能够删除--是否被套餐关联了？？
		List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
		if (setmealIds != null && setmealIds.size() > 0){
				throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
		}
		// 删除菜品表中的菜品数据
		dishMapper.deleteByIds(ids);
		// 删除菜品关联的口味数据
		dishFlavorMapper.deleteByDishIds(ids);
	}

	/**
	 * 根据id查询菜品
	 * @param id
	 * @return
	 */
	@Transactional
	@Override
	public DishVO getByIdWithFlavor(Long id) {
		// 根据id查询菜品数据
		Dish dish = dishMapper.getById(id);
		// 根据id查询口味数据
		List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
		DishVO dishVO = new DishVO();
		BeanUtils.copyProperties(dish,dishVO);
		dishVO.setFlavors(dishFlavors);
		return dishVO;
	}

	/**
	 * 修改菜品
	 * @param dishDTO
	 */
	@Override
	public void updateWithFlavor(DishDTO dishDTO) {
		// 修改菜品表
		Dish dish = new Dish();
		BeanUtils.copyProperties(dishDTO,dish);
		dishMapper.update(dish);
		// 删除原有的口味数据
		dishFlavorMapper.deleteByDishId(dishDTO.getId());
		// 重新插入口味数据
		List<DishFlavor> flavors = dishDTO.getFlavors();
		if (flavors != null && flavors.size() > 0) {
			flavors.forEach(dishFlavor -> {
				dishFlavor.setDishId(dishDTO.getId());
			});
			// 向口味表插入n条数据
			dishFlavorMapper.insertBatch(flavors);
		}
	}

	/**
	 * 根据分类id查询菜品
	 * @param categoryID
	 * @return
	 */
	@Override
	public List<Dish> list(Long categoryID) {
		Dish dish = Dish.builder()
				.categoryId(categoryID)
				.status(StatusConstant.ENABLE)
				.build();
		return dishMapper.list(dish);
	}


	/**
	 * 条件查询菜品和口味
	 * @param dish
	 * @return
	 */
	public List<DishVO> listWithFlavor(Dish dish) {
		List<Dish> dishList = dishMapper.list(dish);

		List<DishVO> dishVOList = new ArrayList<>();

		for (Dish d : dishList) {
			DishVO dishVO = new DishVO();
			BeanUtils.copyProperties(d,dishVO);

			//根据菜品id查询对应的口味
			List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

			dishVO.setFlavors(flavors);
			dishVOList.add(dishVO);
		}

		return dishVOList;
	}
}
